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I'm learning about AWS, and very outside my element, which is typically embedded software. I'm porting this question from Software Engineering after several days of no traction there.

Problem/question: in trying to set up a S3 bucket where file additions trigger a Lambda, how can one debug or trace the sequence of events from file addition to SNS notification to Lambda execution?

I'm trying to set up the following:

1. Someone adds something to a S3 bucket
2. The file addition triggers a Lambda which adds the file to a git repo (More specifically: the file addition triggers a SNS notification on a topic to which a Lambda is subscribed -- I felt this was "better" than the S3 bucket directly invoking the Lambda because of the decoupling)

I'm using the AWS CLI for everything, and for the immediate future, I am limited to using LocalStack to substitute for "real" AWS.

What I've done so far (simplified):

• Created my bucket (aws s3 mb my-bucket --endpoint-url=http://localhost:4572)
• Created a "hello-world" Lambda with attached role-policy aws:policy/AWSLambdaFullAccess
• Added permission to the Lambda (aws lambda add-permission --function-name first_lambda --action lambda:InvokeFunction --statement-id sns-invoke-lambda --principal sns.amazonaws.com --endpoint-url=http://localhost:4574)
• Created a SNS topic (aws sns create-topic --name my-topic --endpoint-url=http://localhost:4575)
• Subscribed my Lambda to the topic (aws sns subscribe --topic-arn arn:aws:sns:us-east-1:000000000000:my-topic --protocol lambda --notification-endpoint arn:aws:lambda:us-east-1:000000000000:function:first_lambda --endpoint-url=http://localhost:4575)
• Configured a put-bucket-notification-configuration (aws s3api put-bucket-notification-configuration --bucket my-bucket --notification-configuration file://s3-ObjectCreated_notify.json --endpoint-url=http://localhost:4572)
• Verified being able to upload and download to/from my bucket
• Verified being able to manually invoke my Lambda (aws lambda invoke --function-name first_lambda outfile.txt --endpoint-url=http://localhost:4574)

This is my "hello-world" Lambda function, naively cobbled together from here and here: